Compass.



E. J. & R. M. RYAN.

COMPASS.

APPLICATION FILED MAY 5.1917.

Patented Nov. 27, 191?.

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EDW'ARD J. RYAN AND ROBERT M. RYAN, OF GUSTER, WISCONSIN.

COMPASS.

Application filed May 5, 1917.

To all whom it may concern:

Be it known that we (1) -EDWARD J. RYAN, ROBERT M. RYAN, citizens of the United States, residing at Custer, in the county of Portage and State of lVisconsin, have in vented certain new and useful Improvements in Compasses; and we do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to new and useful improvements in compasses, and the principal object of the invention is to provide a device which may be cheaply constructed of channel bar stock and which is arranged to enable the user to readily determine the area, circumference and radius of a circle which is being drawn.

Another object of the invention is to provide a means to determine the degrees between the legs of the compass.

A further object of the invention is to provide a device having a novel form of pen cil clamp for holding a pencil or pen in place.

With these and other objects in view, the invention consists in the novel combination and arrangement of parts which will be fully set forth in the following specification and accompanying drawing, in which:

Figure 1 is a side elevation of a compass constructed 1n accordance with this invention.

Fig. 2 is a transverse sectional View on line 22 of Fig. 1.

Fig. 3 is an enlarged transverse sectional view on line 3-3 of Fig. 1.

Fig. '1 is a vertical sectional View on line H of Fig. 3.

Fig. 5 is a fragmentary detail view of the blank from which the pivot leg of the compass is formed, illustrating the scale marked thereon and also showing the blank from which the slide is made, and

Fig. 6 is a detail perspective View of the pencil end of the compass illustrating in detail the pencil holder.

Referring to the drawing 1 designates as an entirety the pivot leg of the compass, While the numeral 2 designates the central leg. Each of these legs is provided at its upper end with a head 3, and these heads are pivoted together as at 4:. The leg 2 is transversely U-shaped, as illustrated in Fig. 2, and the web portion of said leg is ex- Specification of Letters Patent.

Patented Nov. 27, 1917. Serial No. 166,719.

tended beyond the flanges at the free end of the leg and bent upwardly, as at 5, to form a substantially vertical wall. Clamping wings 6 are formed integrally with the side edges of the vertical portion of the web, and formed atthe upper end thereof is an angularly extending brace arm 7 which comprises a continuation of the web and which arm is formed with a reduced tongue 8 for extension into a transverse slot 9 formed in the web of the leg 2, as clearly illustrated in Fig. 1. As shown in the drawing, the inner end of the tongue 8 is flanged to securely hold the same within the socket Sand thus rigidly support the pencil grip in place. Pivoted to one of the flanges of the channel member 2, as at 10, is a link 11, the opposite end of which is pivoted to the slide on the pivot leg of the compass.

The pivot leg of the compass is best illustrated in Figs. 3 and l and comprises a pair of side walls 12 and 13 connected by the in ner and outer walls l l and 15. The wall 13 is provided. with a plurality of graduations 16, which indicate the degrees between the legs, while the wall 14 is provided with a plurality of graduations 17 indicating the area of the circle. A plurality of grndua tions 18 are formed on the wall 12 and indicate the circumference of the circle, while the graduations 19 on the wall 15 indicate the radius of the circle in inches. The end of the leg 1 opposite that having a head 3 formed thereon is reduced, as at 20, and pro vided with a needle point 21, as will be clearly seen upon reference to Fig. 1.

The slide is designated generally by the numeral 22 which comprises four walls designated by the numerals 23, 24;, 25 and 26, The walls 24 and 26 are provided with ears 27 at their meeting edges, which ears are adapted to pivot-ally receive the end of the arm 11 opposite that which is pivoted to the leg 2. A slot 28 is formed in the wall 25 of the slide, and slidably mounted between the wall 25 of the slide and the wall 12 of the leg 1 is a wedge 29 having formed thereon an ear 30 which projects through the slot 28 and serves as a means by which the wedge is manipulated. It will thus be seen that when the wedge is in one position the slide will be free to move on the leg 1, and when in the other position the slide will be firmly locked against movement. The wall 24. of the slide is provided with the legend radius, while the wall 25 of the slide is provided with the legend circumference, while the wall 23 of the slide is provided with the legend area and the wall 26 with the legend protractor. It will thus be seen that when the device is assembled the user may readily determine at a glance what the area, circumference and radius of a circle is, and he may also readily determine the degrees between the legs of the compass. The use of this device will avoid much complicted and laborious calculation which is ordinarily required, and a device is provided by which the user may readily determine the various dimensions of a circle.

It will be understood of course, that the length of the leg 2 and the pencil must be equal to the length of the leg 1 in order to allow the device to operate in the proper manner.

While in the foregoing there has been shown and described the preferred embodiment of this invention, it is to be understood that such changes may be made in the combination and arrangement of parts as will fall within the spirit and scope of the appended claims.

What is claimed is:

1. A compass comprising a pivot leg, a pencil leg pivoted to one end of the pivot leg, a link pivoted to the pencil leg, a slide on the pivot leg, the opposite end of the link being connected to the slide, and a wedge to hold the slide in various adjusted positions on the pivot leg.

2. A compass comprising a pivot leg, a

Copies of this patent may be obtained for pencil leg pivoted to one end of the pivot leg, a link pivoted to the pencil leg, a slide on the pivot leg, the opposite end of the link being connected to the slide, and a wedge operable between the slide and the pivot leg for holding the slide in various adjusted positions on the pivot leg. 7

3. A compass comprising a pivot leg, a pencil leg, the pencil leg comprising a transversely U-shaped channel section, an extension on the free end of the web of the channel section, wings on the extension forming a pencil grip, an arm formed at the upper end of the extension, and a tongue formed at the end of the arm and extending through the web of the channel section, said tongue being riveted in place to hold the device in proper position.

4. A compass comprising a pivot leg, a pencil leg pivoted to one end of the pivot leg, a link pivoted to the pencil leg, aslide on the pivot leg, the opposite end of the link being connected with the slide, and means to hold the slide in various adjusted positions on the pivot leg, and graduations on the pivot leg of the compass to indicate the area, circumference and radius of a circle.

In testimony whereof we afiix our signatures in presence of two witnesses.

EDWARD J. RYAN. ROBERT M. RYAN.

Witnesses:

N101: E. PLATTO, J GEN GOLOMSKI.

five cents each, by addressing the Commissioner of Patents,

Washington, D. 0. 

